LP 415-17 - Three super-Earths around an K Dwarf

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LP 415-17 - Three super-Earths around an K Dwarf

Post by Sirius_Alpha on 21st January 2018, 9:34 pm

A system of three transiting super-Earths in a cool dwarf star
https://arxiv.org/abs/1801.06249

We present the detection of three super-Earths transiting the cool star LP415-17, monitored by K2 mission in its 13th campaign. High resolution spectra obtained with HARPS-N/TNG showed that the star is a mid-late K dwarf. Using spectral synthesis models we infer its effective temperature, surface gravity and metallicity and subse- quently determined from evolutionary models a stellar radius of 0.58 R Sun. The planets have radii of 1.8, 2.6 and 1.9 R Earth and orbital periods of 6.34, 13.85 and 40.72 days. High resolution images discard any significant contamination by an intervening star in the line of sight. The orbit of the furthest planet has radius of 0.18 AU, close to the inner edge of the habitable zone. The system is suitable to improve our understanding of formation and dynamical evolution of super-Earth systems in the rocky - gaseous threshold, their atmospheres, internal structure, composition and interactions with host stars.

Edit: Corrected goofy mistake.


Last edited by Sirius_Alpha on 21st January 2018, 10:00 pm; edited 1 time in total

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Re: LP 415-17 - Three super-Earths around an K Dwarf

Post by Daniel on 21st January 2018, 9:56 pm

It's seems by the paper that the Star is middle to late K dwarf star.
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Re: LP 415-17 - Three super-Earths around an K Dwarf

Post by Sirius_Alpha on 21st January 2018, 10:01 pm

Ah yep! Corrected. Thanks. I saw the name and had LP 358-499 and LP 358-348 in my head still (partially because I was checking to make sure this was indeed a new system). Thanks! Corrected the title.

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Re: LP 415-17 - Three super-Earths around an K Dwarf

Post by Sirius_Alpha on 22nd January 2018, 9:32 pm

Another paper on the same star.

EPIC 210897587: A Bright Metal-Poor M Dwarf with Three Transiting Super-Earths
https://arxiv.org/abs/1801.06957

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Re: LP 415-17 - Three super-Earths around an K Dwarf

Post by Daniel on 23rd January 2018, 7:48 am

Sirius_Alpha wrote:Another paper on the same star.

EPIC 210897587: A Bright Metal-Poor M Dwarf with Three Transiting Super-Earths
https://arxiv.org/abs/1801.06957

So itís a M or K dwarf star?
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Re: LP 415-17 - Three super-Earths around an K Dwarf

Post by Lazarus on 23rd January 2018, 3:37 pm

Daniel wrote:So itís a M or K dwarf star?
Yes Wink
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Re: LP 415-17 - Three super-Earths around an K Dwarf

Post by Edasich on 25th January 2018, 1:20 pm

Anyway it's become K2-155.
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